The magnetically controlled switch can be connected underwater
to a bulkhead connector. The switch will allow the diver to leave the battery pack on the Deco-Line
in OFF position and connect the heater when decompressing. It is a must in situations where the diver needs to switch the battery packs on long decompression dives.

Please note that in order to switch battery packs underwater, each battery pack
must be connected to its own MAG switch before immersion.